<div class="u-checkbox-group" data-bind="foreach: checkBoxData">
    <div data-bind="koCheckBox, css: ko.utils.arrayIndexOfItem($parent.checkedItems(), $data, $parent.customId)?'u-checked': '123', 
        click: function(data, event){$parent.clickCheckBox(data, event);}"></div>
    <label data-bind="html: $data[$parent.customText], css: $parent.checkBoxTextClass"></label>
</div>